66719129 has 2 divisors, whose sum is σ = 66719130. Its totient is φ = 66719128.

The previous prime is 66719119. The next prime is 66719143. The reversal of 66719129 is 92191766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51912025 + 14807104 = 7205^2 + 3848^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66719129 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66719119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33359564 + 33359565.

It is an arithmetic number, because the mean of its divisors is an integer number (33359565).

Almost surely, 2^66719129 is an apocalyptic number.

It is an amenable number.

66719129 is a deficient number, since it is larger than the sum of its proper divisors (1).

66719129 is an equidigital number, since it uses as much as digits as its factorization.

66719129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 41.

The square root of 66719129 is about 8168.1778261740. The cubic root of 66719129 is about 405.5864673199.

The spelling of 66719129 in words is "sixty-six million, seven hundred nineteen thousand, one hundred twenty-nine".